It has extensive range of waves differ in the frequencies and the wavelengths , this range is called electromagnetic spectrum and includes Radio waves , X-rays , Ultraviolet waves , Microwaves , Infrared waves , Visible light waves and Gamma rays .

Scientists believe that each wave needs a medium to transfer through , So , both soundand light need a medium to transfer through it , Scientists therefore assume that the space is filled with a medium that transfers the light wave called the ether .

In 1873 , the British scientists James Clerk Maxwell developed his equations according to the previous work of Michael Faraday which proved the connection between the electric field and the magnetic field where vibrations or the movement of charges generate transverse electromagnetic waves .

As , the propagation of electric waves or magnetic waves does not require a materialistic medium , the electromagnetic waves also do not require the existence of a physical medium spread through which led to the abandonment of scientists on the idea of ether .

In their study of physics , physicists divided into two groups which are Isaac Newton and others though that the lightwas made up of very small particles , Hygens and others though that the light was a wave .

However , modern physics has proven the principle of duel nature of waves, which states that the electromagnetic waves have :

The second law : The incident light ray , the reflected light ray and the normal line at the point of incidence all lie on the same plane perpendicular to the reflecting surface .

When lightfalls perpendicular on a reflecting surface , it reflects on itself , It is easier to see your reflection on the glass window of a lighted room at night when the outside is dark than seeing your reflection in daytime .

When outside the room is so dark , The intensity of light passing from outside into the room is very small , So , the person can see his image as a result of a small amount of light reflected on the glass inside the room .

When outside the room is lighted , The intensity of light passing from outside is larger than the reflected lightintensity inside the room , So , it is difficult for the person to see his image by reflection.